There are already lots of sibling comments saying the heavy use of plastic is "forced on people" by companies, so yes it is talked about. And that's exactly what OP implied.
I'm not even saying this point is entirely false, just want to emphasize that people actually prefer convenient things regardless if it's forced on them or not.
Reply to those comments instead then? Instead of assuming bad faith like "OP implied". I cannot be the only one who doesn't think parent implied anything at all and instead just asked a question why the change happened from glass to plastic.
I think that in a lot of cases plastic is a poor container and that's why I asked the question, for me it's not obvious the convenience of the plastic nor why plastic is the only available packaging material for almost everything.
Not every reply to a comment you make is a personal attack, and it would behoove you to recognize that. Sometimes people just want to enhance a discussion with relevant and topical information, and may even just be curious about your thoughts on related topics.